I hate this. I am becoming more and more sleep deprived. I'm reluctant to call it insomnia because I am able to sleep, but never before 4 a.m. and never longer than 4 or 5 hours. This has been going on for months.
I had this problem 1 1/2 years ago and it went on for almost 6 months.
I did the exact same thing, too. I broke up with my ex once, got back together, and after 1 month I broke up again. It's the worst thing I've ever done and I still feel ashamed.
BUT I know now that it was for the better. I wasn't happy with the relationship and I only made her more and more miserable. So I ended it. For good.
I was cursed at. A lot. And I deserved it.
Here's a BUT again :p After some time she was over me and found a new guy. And as I've heard she's happy.
I'm in a great relationship now with a really wonderful girl. And I'm happy.
What I want to say is, everything will turn out to be good eventually.
You should break up. That's all the advice I can give you.